Cannot use Upfront and not install Themes

Hi there
This is the message I get in my plugin area:
Unfortunately, we do not seem to have Upfront core installed on this site. We need that for the Upfront Builder plugin to work. Get it here.
When I try to install an Upfront theme I get this message
Installation of spirit failed. Most likely reason for this are wrong folder permissions of your wp-contents folder.
Thank you very much for your help.
Kind regards
Armin

    Nastia

    Hello Armin , hope you are doing well!

    To install Upfront Builder, the Upfront framework needs to be installed first. Upfront framework is included in Upfront themes.

    When I try to install an Upfront theme I get this message
    Installation of spirit failed. Most likely reason for this are wrong folder permissions of your wp-contents folder.

    Do all themes show the same message? To resolve this issue, try applying proper file permissions to the files of your WordPress install.
    Please check the wp-content and plugins folder permission if they are set to 744, if not, please set them to 744.

    Please see here how to apply properly the folder permissions:
    http://codex.wordpress.org/Changing_File_Permissions
    https://premium.wpmudev.org/blog/understanding-file-permissions/

    Let me know how it went!

    Kind regards,
    Nastia

    Denitsa

    Hello Armin,
    I trust you're well!

    Are you able to also install plugins via the WPMU DEV Dashboard?

    There could be some related errors in the debug log that can shed some light on the matter, so could you please access your server through FTP, edit the wp-config.php file, find a line like
    define('WP_DEBUG', false);

    and replace it with the following (if the above line doesn’t exist, simply insert next snippet just above the /* That's all, stop editing! Happy blogging. */ comment)

    // Enable WP_DEBUG mode
    define('WP_DEBUG', true);
    // Enable Debug logging to the /wp-content/debug.log file
    define('WP_DEBUG_LOG', true);
    // Disable display of errors and warnings
    define('WP_DEBUG_DISPLAY', false);
    @ini_set('display_errors', 0);

    The log will be saved to a debug.log file inside the "/wp-content" folder. Please save the file as a .txt and attach it to your next post.
    If the file's larger than 5MB you might need to upload it somewhere like Dropbox and share the link here.

    Also, if we could see the issue directly on your install it could help us to better understand and solve it.
    Can you please grant support access from the dashboard plugin so we can take a closer look?
    This could be done via Dashboard - WPMU DEV -> Support -> Support Access -> Grant Access or by following this guide here:
    https://premium.wpmudev.org/manuals/wpmu-dev-dashboard-enabling-staff-login/

    Let me know here once you've done that please

    Regards,
    Denitsa